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Old 12-21-2013, 04:22 PM   #1
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Battery Drain problem

we have a 15 year old wrangler with a new battery.
However, unless run everyday, the battery drains to zero.
The battery will then take a full re-charge and the jeep starts up normally.

Any suggestions on causals and how to fix??

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Old 12-21-2013, 07:21 PM   #2
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Take it to any auto parts store and have them run a check on the charging system.

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Old 12-21-2013, 07:56 PM   #3
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Quote:
Originally Posted by daggo66 View Post
Take it to any auto parts store and have them run a check on the charging system.
...yeah, but it sounds like his charging system is working...cuz if he runs it everyday it starts...

...start looking for something not turning off...or an unfused dead short somewhere...

...set up a digital multimeter to measure amperage draw from the battery, and begin pulling fuses one at a time until the draw drops...that will give you a good idea of the system that's causing your drain...
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Old 12-22-2013, 09:04 AM   #4
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Go get a discharge test done on the battery first. It might be brand new, but it could be a bad one.
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Old 12-22-2013, 10:42 AM   #5
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If your battery is O.K., which is questionable, then you have something drawing to much amperage when not in use.

Have your battery and charging system checked first! If that is O.K., then they should be able to test the draw on your electrical system........
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Old 12-22-2013, 11:18 AM   #6
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i was going to do some pictures for you so you could see how to set up a parasitic draw test on your system...but damn it's cold out there, and the garage is full.

so...youtube to the rescue!

i have watched this in it's entirety, and fully agree with everything this guy says...do this and you will find your problem...



REMEMBER! Do it on the Negative (Black) terminal of your battery!
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Old 12-22-2013, 11:22 AM   #7
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...a dead short tends to resolve itself by meting things...
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Old 12-23-2013, 10:58 AM   #8
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My 08 JK Rubicon had a parasitic draw and it turned out to be the Driver's Door. My Jeep was repaired from when an 18 wheeler had PITTED me and punched my door. The repair shop didn't get the door plugged in all the way to the harness. As a result, like mentioned on the YouTube Video, the systems never went into sleep mode. In fact - it was almost the same draw as shown in the video 3.6 amps. The dome light when off, but it never went down to 50ma. Killed my Odyssey Battery. Anyway - once I disconnected the door and then reconnected it - after about 3.5 minutes, the Jeep would go to sleep and the current draw dropped down to below 50ma.

So one check you might try is to make sure your door are all plugged in tightly - or disconnect entirely and see if you still have a draw going on.
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Old 12-24-2013, 09:05 AM   #9
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Another overlooked component in parasitic draw issues is the alternator itself. Alternators produce A/C voltage and it is converted to D/C voltage though what is called a rectifier bridge which is a system of diodes. In some instances when the rectifier failed the alternator will still charge when the engine is running but when the engine is turned off the alternator will drain voltage from the battery by allow the electromagnet know as the rotor to stay energized. You can check this by testing the A/C voltage output of the alternator. If it's emitting A/C voltage you have a problem.
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Old 12-24-2013, 10:00 AM   #10
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